The inside dimension is adjustable from 1 1/2" to 1 3/4" and has a 1/2" hole. It is made from 1/4" plate and fits on a 3" or 3 1/4" axle tube. This curved style comes in handy when you need to offset the shock off the axle tube. If you are running a larger shock like a coil over this would be a great option.
Sold in pairs